code: def test_substitute(self):
      texts = [
          "Older people feel more youthful when they also feel in control.",
          "Good bad",
          "Heart patients may benefit more from exercise than healthy people.",
          "Beer first or wine, either way might not be fine.",
      ]
  
      for aug in self.augs:
          for text in texts:
              for _ in range(5):
                  augmented_data = aug.augment(text)
                  augmented_text = augmented_data[0]
                  self.assertNotEqual(text, augmented_text)
  
file_path: nlpaug/test/augmenter/word/test_antonym.py
imports: import unittest
  import os
  from dotenv import load_dotenv
  import nlpaug.augmenter.word
label_desc: Use image node_id 2 for calling the TestAntonym obj's underlying member method code with example usage: obj.test_substitute() without return types